Memphis 16ST1000D

[S Merlington]

This amp came in with shorted outputs..

I replaced the outputs but it keeps blowing the new outputs ..

Is there a common problem with these amps?

Wondering since everything is testing fine

 

[Perry Babin]

If it has socketed driver boards, remove them. Does the amp power up and the relay engage?

 

[S Merlington]

The driver boards are solderd to the main board ..

If I remove the bad outputs
Q256,255,215,216.

The amp will power up and relay engages

 

[Perry Babin]

There are 6 outputs per side. Did all 4 of the ones you listed short?

Do you have a good drive signal on all of the outputs on the bad side?

 

[S Merlington]

All 4 of them shorted ..

2 on 1 side the other 2 on the other side of the board ..

I cannot get my scope to lock onto the drive signal..

Here's what I get in the pads for the outputs

Gate:-55.6
Drain:62.4
Source:-53.8

 

[Perry Babin]

Are you sure that none of the 9640s are leaky?

 

[S Merlington]

do you happen to know what locations the 9640's go in?

When I got this amp it had all 640's in it

 

[Perry Babin]

There are 2 640s per side. The rest are 9640s. You can see that the center legs for all like FETs are directly connected.

 

[S Merlington]

This amp keeps blowing the outputs..

All of the outputs are removed right now ..

How do I check the drive signal on this amp with all of the outputs removed ?